(04-19) 19:51 PDT San Francisco -- A pair of incidents that injured two Bay Area law enforcement officers were under investigation Saturday, one that happened during a police chase through residential neighborhoods in San Francisco and the other that took place alongside a San Jose freeway.

The San Francisco incident began at about 6:45 a.m. Saturday with the report of a robbery in the 3400 block of Balboa Street, and the suspects firing a gun nearby in the 600 block of 35th Avenue, police said.

A police officer spotted the suspects' vehicle at Cabrillo Street and 28th Avenue and a chase ensued. The early-morning pursuit through the normally placid Richmond and Sunset districts ended at 20th Avenue and Lincoln Way when the suspects and the police vehicle collided.

The driver of the fleeing vehicle, Kenneth Perry, 48, of San Francisco, was arrested and faces several charges, including possession of a stolen vehicle and aggravated assault. The passenger, Joseph Depaoli, 37, of San Francisco, was arrested and faces several similar charges, as well as being a felon in possession of ammunition. Both were treated for injuries at the hospital and released Saturday, police said.

One officer, who was not identified, was injured in the collision and taken to the hospital, where he was treated for injuries Saturday and released.

The San Jose incident began at 10:40 p.m. Friday when two California Highway Patrol officers pulled over a vehicle headed north on Highway 101 north of the Alum Rock Avenue exit and were giving the driver a traffic ticket.

As the officers were outside their patrol car, the driver of a small silver sedan sideswiped the CHP vehicle, striking one of the officers, police said.

The driver of the silver sedan sped away and has not been located. The officer who was struck was taken to San Jose Regional Medical Center, where he was treated for minor injuries and released.

The California Highway Patrol asks that anyone with information about the incident call its San Jose office at (408) 467-5400. The silver vehicle will have damage on the right side and front of the car and is missing its left side mirror.